Finned cylinder



Jan; 15, 1946.

FINNED CYLINDER Filed Oct. 9, 1945 {Ob v i INVENTOR Warren H. Farr w. H. FARR 2,393,036

- threads on the outer surface of a, cylinder bar- 10 a final compressed shape to give it a permanent,

- will be apparent from the following description projections may be made in'the same way.

- made to the accompanying drawing, wherein the been described for purposes of illustration, it is a; l mp-LE3 Patented 1946 I I v Warren H. Farr, Detroit, Mich, ignor to add Wheel Company, Philadelphia, Put, a corpora. tion of Pennsylvania Application October 9, 1943, Serial No. 505,591

, 1 Claim. (01.257-261) i This invention relates to a heat transfer struccomminuted metal and suitable binder accordture, such as of a finned cylinder, and has for an ing to methods now well known in powder metalobject the provision of improvements in this art. lurgy for diiierent and unrelated purposes. A

Cylinders of internal combustion engines, metal of good heat transfer properties, such as compnssors. and the like often require cooling cqpper, aluminum, silver, etc., may be used, copfins. The fins may be cast integrally with the 5 per being at present preferred. barrel, but since the cylinder is usually of a The molded structure may for some purposes strong metal like steel the fins do not exchange have value without further treatment but prefheat as rapidly as desired. It is common to form erably it is sintered under heat and pressure to rel or sleeve tosecure a cylinder head. The homogeneous, strong character. The fins are threads are raised externally to keep the barrel pressed principally axially to make them thinner thin and uniform. There is also usually an anrather than smaller in diameter. chorage flange near the lower end of the cylinder. By this same action the fin structure is shrunk Consequently there is an annular groove in the and bonded to the cylinder barrel, thus forming a cylinder barrel where the fins are to be located. 15 good heat transfer medium for the cylinder.

Many methods have been proposed for pro- The fins may have any shape and dis siti n viding fins of good heat transfer material on the desired, either annular, spiral; axial or any other cylinder within the groove. It is an object of the, arrangement. Preferably they are circumferpresent invention to providea new and improved entially disposed and joined at the base so as to method of furnishing such cylinders or others form a mechanically strong tight mufi or band with cooling projections or fins and to provide on the cylinder barrel. The fln-connecting base a new and improved finned cylinder structure. band is compressed radially during sinterlng. In-

The objects and advantages of the invention stead of fins some other form of heat transfer of an exemplary embodiment, reference being While one embodiment of the invention has single figure is an axial section of a finned cyltobe understood that there may be various eminder made in accordance with the present inbodiments within the limits of the prior art and vention. the scope of the subjoined claim. In the embodiment illustrated a cylinder bar- What is claimed is: rel I 0 is formed with an anchorage flange I 0a A finned engine cylinder construction comprisand head-attaching external threads Mb, a ciring a barrel of ferrous metal having a circumfercumferential groove 10c being left between the ential groove therein, and a-circumferentially flange and threads. finned muif of heat and pressure sintered cop- According to the present invention there is per powder molded and sintered in situ on the built up in situ in the groove lllc a finned strucbarrel. ture I2 of any desired form or arrangement oi WARREN H. FARR. 

